Wie stellt man Zahlen in Go als alphabetische Zeichen dar?

<code class="go">import "fmt"

func toChar(i int) rune {
    return rune('A' - 1 + i)
}

func main() {
    for _, i := range []int{1, 2, 23, 26} {
        fmt.Printf("%d %q\n", i, toChar(i))
    }
}</code>

<code class="go">func toCharStr(i int) string {
    return string('A' - 1 + i)
}

func main() {
    for _, i := range []int{1, 2, 23, 26} {
        fmt.Printf("%d \"%s\"\n", i, toCharStr(i))
    }
}</code>

<code class="go">var arr = [...]string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
    "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"}

func toCharStrArr(i int) string {
    return arr[i-1]
}

func main() {
    for _, i := range []int{1, 2, 23, 26} {
        fmt.Printf("%d \"%s\"\n", i, toCharStrArr(i))
    }
}</code>

<code class="go">const abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

func toCharStrConst(i int) string {
    return abc[i-1 : i]
}

func main() {
    for _, i := range []int{1, 2, 23, 26} {
        fmt.Printf("%d \"%s\"\n", i, toCharStrConst(i))
    }
}</code>